My own view - there are allot of risks associated with this - we place water in people tanks and they get sick - who is liable??? CFS is, even if our tank were clean, out pump faultless and our hoses for delivery clean, (mmm now show me a brigade or manufacture who will guarantee this) who guarantees the cleanliness of the tank we are putting it into.
There are commercial water carter's who provide this service or maybe better still there should be pressure applied to the government to provide this service to our struggling rural community, after all if a main bursts in the city areas, SAWater supples casks of spring water to assist residents with drinking requirements, maybe this should be extend to the country to assist people with their water requirements.
There are many ways we can help our communities outside of emergency response however I believe this is a little risky - I for one wouldn't want to be drinking water from a fire appliance long term!